isaspec: encode size optimization
Originally I had hoped that the compiler's CSE would be able to de-duplicate identical encoding for similar instructions. But it was not. So this MR splits the bitset encoding out to helper "snippet" functions which are de-duplicated by means of a hashtable. Which drastically reduces the size of the resulting object file. For an aarch64 release build:
add/remove: 51/15 grow/shrink: 3/3 up/down: 40772/-200496 (-159724)
Function old new delta
snippet__instruction_9.constprop.isra - 2424 +2424
snippet__instruction_8.constprop.isra - 2424 +2424
snippet__instruction_11.constprop.isra - 2424 +2424
snippet__instruction_10.constprop.isra - 2424 +2424
snippet__instruction_7.constprop.isra - 2148 +2148
snippet__instruction_24.constprop - 1984 +1984
snippet__instruction_22.constprop - 1976 +1976
snippet__instruction_26.constprop - 1968 +1968
snippet__instruction_23.constprop - 1968 +1968
snippet__instruction_25.constprop - 1956 +1956
snippet__instruction_27.constprop - 1952 +1952
snippet__instruction_28.constprop - 1940 +1940
snippet__instruction_20.constprop.isra - 1708 +1708
snippet__instruction_18.constprop - 1632 +1632
snippet__instruction_16.constprop - 1632 +1632
snippet__instruction_17.constprop - 1436 +1436
snippet__instruction_40.constprop.isra - 1312 +1312
snippet__instruction_39.constprop.isra - 624 +624
snippet__instruction_38.constprop.isra - 624 +624
snippet__instruction_44.constprop.isra - 592 +592
snippet__instruction_21.constprop - 532 +532
snippet__instruction_13.constprop.isra - 468 +468
snippet__instruction_12.constprop.isra - 428 +428
snippet__cat5_src3_0 - 344 +344
snippet__instruction_35.constprop.isra - 328 +328
snippet__instruction_33.constprop.isra - 296 +296
snippet__instruction_6.constprop - 292 +292
snippet__reg_gpr_0.constprop.isra - 256 +256
snippet__instruction_46.constprop - 248 +248
snippet__instruction_5.constprop - 232 +232
snippet__instruction_3.constprop - 200 +200
snippet__instruction_1.constprop - 200 +200
snippet__cat1_immed_src_0.constprop.isra - 196 +196
snippet__instruction_42.constprop.isra - 176 +176
snippet__instruction_2.constprop - 164 +164
snippet__instruction_0.constprop - 164 +164
encode__cat6_src.isra - 136 +136
snippet__multisrc_4.constprop.isra - 128 +128
snippet__multisrc_1.constprop - 116 +116
encode__cat6_typed.isra - 76 +76
encode__cat6_base.isra - 76 +76
encode__cat5_s2en_bindless_base.isra - 76 +76
encode__reg_relative_gpr.isra - 72 +72
encode__reg_const.isra - 72 +72
encode__cat5_tex.isra - 72 +72
encode__cat5_samp.isra - 72 +72
encode__cat5_type.isra - 44 +44
snippet__cat1_gpr_src_0.constprop.isra - 40 +40
encode__cat1_relative_gpr_src.isra - 36 +36
encode__cat1_const_src.isra - 36 +36
snippet__cat3_src_2.constprop.isra - 32 +32
encode__cat5_src2.isra 84 92 +8
encode__cat5_src1.isra 80 84 +4
encode__cat1_dst.isra 96 100 +4
encode__cat3_src.isra 276 244 -32
encode__cat1_relative_gpr_src.constprop.isra 40 - -40
encode__cat1_gpr_src.constprop.isra 40 - -40
encode__cat1_const_src.constprop.isra 40 - -40
encode__cat5_type.constprop.isra 44 - -44
encode__reg_const.constprop.isra 68 - -68
encode__cat5_tex.constprop.isra 68 - -68
encode__cat5_samp.constprop.isra 68 - -68
encode__reg_relative_gpr.constprop.isra 72 - -72
encode__cat6_base.constprop.isra 72 - -72
encode__cat5_s2en_bindless_base.constprop.isra 72 - -72
encode__cat6_typed.constprop 76 - -76
encode__cat6_src.constprop.isra 132 - -132
encode__cat1_immed_src.constprop.isra 196 - -196
encode__reg_gpr.constprop.isra 256 - -256
encode__multisrc 848 556 -292
encode__cat5_src3 336 - -336
encode__instruction.constprop 211384 12792 -198592
Total: Before=215964, After=56240, chg -73.96%/cc @austriancoder